I used the pie angle feature on a circle to make Pac-Man's body. I reflected a copy for the eye and stretched the ellipse vertically. The pellets are small rectangles with rounded corners. The Power-pellet on the end is just a circle. The road he's traveling on is a line segment that I widened on one end with the Width Tool. The ghosts's bodies were much more complicated. I used a variety of tools and effects, including the zig zag effect and some of the pathfinder options.